puyopuyotetr.is/config/webpack/configuration.js

// Common configuration for webpacker loaded from config/webpacker.yml

const { lstatSync, readFileSync } = require('fs');
const { basename, dirname, join, resolve } = require('path');
const { env } = require('process');

const glob = require('glob');
const { load } = require('js-yaml');

const configPath = resolve('config', 'webpacker.yml');
const settings = load(readFileSync(configPath), 'utf8')[env.RAILS_ENV || env.NODE_ENV];
const flavourFiles = glob.sync('app/javascript/flavours/*/theme.yml');
const skinFiles = glob.sync('app/javascript/skins/*/*');
const flavours = {};

flavourFiles.forEach((flavourFile) => {
  const { locales, inherit_locales, pack_directory } = load(readFileSync(flavourFile), 'utf8');

  flavours[basename(dirname(flavourFile))] = {
    name: basename(dirname(flavourFile)),
    locales: locales ? join(dirname(flavourFile), locales) : null,
    inherit_locales,
    pack_directory: pack_directory,
    skin: {},
  };
});

skinFiles.forEach((skinFile) => {
  let skin = basename(skinFile);
  const name = basename(dirname(skinFile));
  if (!flavours[name]) {
    return;
  }
  const data = flavours[name].skin;
  if (lstatSync(skinFile).isDirectory()) {
    data[skin] = {};
    // TODO: more cleanly take the first match
    const skinPacks = glob.sync(join(skinFile, '{common,index,application}.{css,scss}'));
    skinPacks.forEach((pack) => {
      data[skin] = pack;
    });
  } else if ((skin = skin.match(/^(.*)\.s?css$/i))) {
    data[skin[1]] = skinFile;
  }
});

const output = {
  path: resolve('public', settings.public_output_path),
  publicPath: `/${settings.public_output_path}/`,
};

module.exports = {
  settings,
  flavours,
  env: {
    NODE_ENV: env.NODE_ENV,
    PUBLIC_OUTPUT_PATH: settings.public_output_path,
  },
  output,
};